Common mistakes in English - category Typography

Non-standard question mark Apostrophe in dates require typewriter (straight) apostrophe (') require typographical (curly) apostrophe (’) Smart ellipsis (…) Whitespace after currency symbols: '$ 100' ($100) (c) instead of © (R) instead of ® (TM) instead of ™ number + (th, nd, st, rd) O Connor (O'Connor) TL DR (TL;DR) Non-standard alphabetic characters Non-standard comma Mathematics: +- - ± Mathematics: Multiplication: x - × Typography for hypotheses Arrows: -> (→) Capitalization of words derived from proper nouns Apostrophe in holidays (Mother's Day) two tank's (tanks) Wrong apostrophe character Smart quotes (“”) Position of currency symbols: '100$' ($100) missing apostrophe double quote instead of apostrophe redundant apostrophe space after apostrophe in contraction (e.g. I' m) 12,5% → 12.5% 3dogs (3 dogs)